Calculating machine



Nov. 15, 1949 GRIP ET AL CALCULATING MACHINE 5 Shets-Sheet 1 Filed May5, 1944 Ham 3W8 M mm fR/K G/F/P 2 5 70/91. TflOR EZL A TTUR/VEYS Nov.15, 1949 E. GRIP ETAL 2,488,011

CALCULATING MACHINE Filed May 5, 1944 5 Sheets-Sheet 2 Nbv. 1 5, 1949 vE. GRIP ETAL CALCULATING MACHINE 5 Sheets-Sheet 5 Filed May 5, 1944 Rmsaw Mmm 5X0, WV, m M W W m wm n WKZ A 0% Nov. 15, 1949 E. GRIP ETAL2,488,011

CALCULATING MACHINE Filed May 5, 1944 5 SheetsSheet 4 ma 4 mo wwwms Nov.15, 1949 E. GRIP -ETAL 2,488,011

CALCULATING MACHINE Filed May 5, 1944 5 Sheets-Sheet s Ill 1 A7Z|Illllllllll In -tion. It'may-be applied, for instance, to'pinPatented Nov.

"UNITED STATES OFFICE 7 6 Claims. 1

This invention relates to calculating machines and'more" particularly tomultiplying machines having an actuator to be operated in twodirections, that is the direction and the direcwheel or Odhner machines.

The chief purpose of this invention is to sim- -plifythe mechanism forautomatic shifting in operations of multiplication.

Another purpose of this invention is to get the necessary shiftingimpulses in such machines with automatic shifting in a'manner moresimple and more' reliable than heretofore, especially when the machineisalso capable of automatic division.

'Another purpose'is'to render it possible todepress the operation keysmore easily by the finger.

Another purpose of this invention'is to create a directandpos'itive'disengagement'oi the driving mechanism, that is of themotor coupling, "without theu'se of anysprings.

Anotherpurposefof thisinvention is to render the machine more" reliableand less sensitive to shocks and rough"handling;- in other Wordsftherisk of machine faults is essentially reduced.

This is of'course most important in rapidly operating calculatingmachines driven by electric i motors.

I pressions wards, forwards, backwards, front and back are usedin" thisspecification and in the claims as such directions appear to an operatorsitting at the key-board of "themachine to manipulate it.

One embodiment 'of" an improved calculating machine in accordance withthis invention is i1- lustrated in the annexed drawings.

- and is substantially an end view from the rightside of the machine,with the right end plate Fig. 1 shows a section on the line I-I of FigsZ removed.

Fig. 2- shows-afront view of the upper part of I the driving mechanismproper.

' viewed from above.

Fig. 4 shows a top view of the'dr'iving mechanism proper.

mediately to the left of the driving mechanism 50 fin proper.

1ineVII'-VII'- of"Fig. 1; showing aguiding plate? Fig. 6 isacross-sectionalview taken on the line'-"VI--VIof Fig. 1. g

Fig, 7 isacross-sectional view taken on the,

Fig. 3-shows a detail-view of the stop discs. asts *1 setting arm for"setting the machine to direct subtractionyt'ogether with thepartscooperating therewith.

Fig. 13 showsaside view'of the multiplication '15 Fig.- -14fshows-a sideview of the member for 7 holding down the multiplying and division keysGrey holding-down lever) Fig. lS-showsatop view of some control memi'bels arranged 'below the bottom plate on the m chin g 1 Fig: 16 s howsa topview of the driving transmis ns a Fig l'l is across-sectional View onthe line XVII- XVII of Fig. 16. V For the sake of clearness, only theessential parts areshown in the various figures. The machine illustratedin the drawings is in its''elsseiiti 'al featuresconstructed inaccordance j' sfPatent s No 2, 103,596 No. 1,927,771, No. 2243975 and'Nof2,-393,2 86, though the invention "bynd'rneansislimited thereto. Seealso U. S. Pat- ;fnt ;l Io."2,431,930"and U. S. patent applications Nos.ssageijgpatent'No."2,403;361 dated June}, 194:6) and'5 34,43"(corresponding respectively to Britis'H'Patents,N0sT57 iJ00fl and575,100).

Thefinachineillustrated in the'drawings is of the Od'hiie'r'or" wheeltype and has an actuatororpin'wheel ijotorR (Fig. 16) arranged in acarriage 'siiiftablealbng'the'main shaft58. For '40 carrying out thecalculating operations this shaft together with the actuatbrR'is rotatedin either ""d'irection ofrotation, that is or direction,"fleeing"counterclockwise and clockwise, respectiv'elyj'in'Fig; 1;";seearrows. v

Trish t 'lflfisdriveuby am'otorM and carries a gear i I' dr 'ing' ajgearllajwhichto'gether with 'janotherfgea flo "(Figsg 114 and 16)' issecured to fa" shaftf l3. The'gear 12a drives directly 2; gear I whilethe'ge'ar lZb drives a gear 15 through an tjerii jediatet'gearflfl 'Ihe'two'ge'ars l4, I5are 'freely journalledwn the shaft l6 and conse-'quently-th'ey 'always'ro'ta'te in'opposite directions --'as long"as'thednotor'runs. Either of these gears -j4"or *IE rnay'be coupled to theshaft l5 by means -of the"coupling-' pawl 'l8,-'-which"is rockable on apin ifia. This pin extends at right angles to the shaft 5 6, and issecured in the block I9 rigidly attached to the shaft l6 and passesthrough a slot in said block. Said slot is parallel with the shaft i5and in it the pawl I8 is thus journalled. When said pawl is rocked inone direction or the other, its lateral projections will engageshoulders or offsets 26 (Figs. 16 and 17) on the sides of the gears idand I5, respectively. This couples the shaft 56 to the gear Id or l5,respectively, that is, the shaft 16 is rotated in one direction or theother, because the gears M and l 5 rotate in opposite directions. Bymeans of the gears B the shaft I8 is in permanent driving connectionwith the main shaft 58 of the machine, which carries the actuator R.Thus, the actuator is rotated in the direction or the directionaccording'as the pawl 18 is coupled to the toothed wheel IE or M,respectively.

For guiding the pawl 6 to engage and to disengage the shoulders on thegears i i and I5, said pawl has a point or head at that end which ismost remote from the pin lSa. This point enters a guiding slot 2! ahaving oblique entrance edges 2ib. This slot is cut in a movable guidingmember 2i (Figs. 1, 2 and 7), and the point of the pawl 83 is in theguiding slot 2 la, when the shaft i6 is at rest, that is when theactuator is in its full cycle position. When the shaft 16 rotates, thepoint of the pawl l8 engages one side or the other of a stationaryarcuate guiding rail 22 (Fig. 1). Thus, the pawl I8 is positively guidedduring that part of the rotation of the shaft l6 during which the pointof the pawl is outside of the slot Ma. The guiding rail 22 is preferablyresiliently suspended. In other words, the slot Zia and the rail 22together guide thepawl l8 during the whole revolution of 360. Normally,the guiding member 2! with its guiding slot 21a is in its middle orcentral position (Fig. 7) and then the pawl 18 is disengaged from theshoulders 26. When in the manner stated below the guiding member 25 ismoved to either side, it rocks the pawl 86 correspondingly to engage thecorresponding shoulder on the gears M or I5.

A rocking arm 23 is pivotally journalled on the stationary pin 24: andone end 23a (Figs. 1 and 4) of it enters the space between two cam discs25 and 26, which are secured to the shaft l3 and consequently rotate,when the motor runs. This swings the arm 23 to and fro with areciprocating or pendulous motion on the pin 25. The opposite end ofthis arm has a recess '21 (Fig. 2).

Two coupling rods 28 and 29 are displaceably journalled on pins 39(Figs. 1 and 2) secured to the stationary plate (frame part) 3! andentering oblong slots in the rods. Said rods may, therefore, bedisplaced in their longitudinal direction, and springs 32 are tensionedbetween said rods and stationary pins 33 and tend to lift the rods totheir uppermost position. At their upper ends, these rods carry pins 34entering slots 35 of an angular piece 36 which is displaceablelaterally, that is parallel with the shaft I6, on a stationary shaft 31(Figs. 1 and 7) secured between the two intermediate walls 38 and 39 ofthe machine frame. The angular piece 36 is rigidly connected with theguiding member 2| to form a rigid unit, normally kept in its centralposition between the walls 38 and 39 by a spring 46, as shown in Fig.'7. When the angular piece 36 and the guiding member 2i are in thiscentral position, the pawl 18 is disengaged from the shoulders 20, asmentioned above. The angular piece 36 has a projection 4i .wall 39 andis pressed by a spring 41 in such direction (clockwise in Figs. 1 and11) that the part 52 engages the projection 4|.

A pin 48 (Figs. 1, 2 and 6) is riveted to the angular piece 36 andenters the space between two double-conical pins 49 and 56. The pins 49and 56 may also be described as having the shape A of hyperboloids ofrotation. These pins are riveted to the back ends of stopping pawls 5|and 52, respectively, rotatably journalled on a pin 53 secured to theside wall 39. Around this pin a torsion spring 56I is wound, acting uponthe two stopping pawls so that the double-conical pins 43, 56 arepressed towards each other to engage the pin 48.

When the machine is at rest and no operation of calculation is beingcarried out, the two stopping pawls 5! and 52 engage their respectivestopping shoulders 54 and 55 of two buffer discs 55 and 57 (Figs. 1, 3,l0 and 11), said torsion spring 52! pressing the points of the pawlsinwards against the periphery of said buffer discs which are rotatablyjournalled on the main shaft 58 of the machine, which shaft carries theactuator R. Between the two discs 56 and 57 a strong buffer spring(compression spring) 59 is'arranged which presses those discs to engagean eccentric bushing or sleeve 66 (Figs. 1, 3, 8 and 9). This bushing iseither itself non-circular, for instance,

oval or elliptic in cross-section, or is eccentrically journalled ona'screw or stud bolt 6| which is secured for instance riveted to a camdisc 62 rigidly connected with the main shaft 56. On the screw 6| a nut63 is screwed keeping the bushing 66 in its angular position as set onthe screw 6|. It is to be observed that the cam disc 62 is eccentricallyarranged on the main shaft 58 and the circular slot 64 cut in said discis consequently eccentric in relation to the main shaft 58. A roller 65(Figs. 1 and 5) enters said slot and is journalled on a three-armedlever or release arm 3E6 which is, pivoted on the stationary pin 67. Thehorizontal arm 65 of said lever extends inwards through the spacebetween the rods 28 and 29 (Figs. 1 and 2) to engage the edges 68 ofsaid rods from above. At this place the arm 66 is broadened so that itcan cooperate with the edges 68 of both rods 28' and 29, as is shown inFig. 2. 'To the lower arm of the release lever 3l0 a three-armed hook 69is rotatably journalled on the pin 16. A torsion spring ll is woundaround said pin and tends to rock the hook 69 counterclockwise in Figs.1 and 5.

Under the action of this spring the back arm 65a of hook 69 engages apin 12 secured to the intermediate wall 39. In addition, the hook 69 hasa bent portion or tab 13 which extends laterally below the projections14(Figs. 1 and 13) on the two keys l5 and 16, that is themultiplicaspectively. These keys are rotatably journalled on astationary shaft 11 and are acted upon byin'dividual springs 18 pressingthe back end of thekey against the stationary guide 31. In addition,these keys have hooks 19 engaging the edges 68 of the rods 28, 29 fromabove to normally prevent the spring 32 from lifting said rods, that iswhen the key '15 or 16, respectively, is not depressed. It is to beobserved that the key 15 cooperates with the rod 29 and the key 16 withthe rod 29. Each key 15 or 76 has a hook 8|, which is rockablyjournalled on a pin 90 on the key and is pressed by a spring 92 toengage the pin 83 on the key. The points 94 of said hooks are somewhatlower than the striking edges 68 of the rods 28, 29, when said rods arein their lowermost position. The keys l5, 19 are integrally formed withthe arms 85 and also with the arms 299 or 295, respectively. The arms 85of said keys engage the pin 33 la of an angular piece or contact lever39! which is pivoted on the stationary pin 333 and controls the electricmotor contacts 339. When one of the lreys E5 or T6 is depressed, thecontact lever 33! is rocked to close the motor contacts 334 starting themotor. The arms 299 and 29! of the keys i5 and '16, respectively, enterin well-known manner a recess in a plus minus-control plate 59? which isarranged below the base plate of the machine, as shown in Figs. 1 and 5.Reference is made to the corresponding parts 299, 291, 28'? in U. S.Patent No. 2,398,286.

A lever 88 (Figs. 1, 4 and 5) is rockably jiournalled on the stationarypin 93' secured to the frame 8.3. This lever has four bent tongues ortabs 89, 99, 9i and 92. The tongue 89 (Figs. 1

and 5) extends through a hole in the interme- U diate wall 39 inwardsabove the arm 69a of the hook B9. The tongue. 99 forms a striking edgefor the lever 91! which is pivoted on the stationary pin 32.5 and withits surface 99 engages the tongue 99. The tongue 91 engages the arm )2which in well-known manner is acted upon by the tens transfer hook orlever for the totalizer wheel of the highest denomination in the resultsregister. When a ten is carried into that totalizer wheel the arm I92 isswung in the direction of the arrow A in Fig. 5, that is clock wise, asis described in detail for the part 102 U. S. Patent No. 2,398,285.Finally, the tongue 92 engages the lever 49 (Figs. 1, 5 and 11) torock-that arm, when the lever 89 is swung counterclockwise. A tensionspring 94 presses the arm 86' andits tongue iii to engage the arm I92.

The rocking or driving lever 29? (Figs. 1 and 5) drives in well-knownmanner the swing lever 24?, and also the plus-minus controi plate 281.For details, reference is made to parts 267, 247 and 287 in U. 8. PatentNo. 2,398,286. The swing lever 24"! eiiects the shifting and the controlplate 281 pulls down the keys i5 and i6 during thecalculatingoperations. This control plate 281 is set to its position and positionby means of the reversal lever 294 in dependence ofthesetting of theangular piece 36 to which the reversal lever is directly connected.Depending upon how said angular piece and consequently the control plate231 are set said controlplate engages one of the projections 29E], 29lof the multiplication key 15 or the division key. i6 (as described forthe corresponding parts 287,290,291 in U. S. Patent No. 2,398,286.

The key holding-downlever 99 (Figs. 1 and 14) whichv is, rotatablyjournalled on the stationary pin 96 of the wall39 has a front bentportion 91 extending inwards through a. hole in the intermediate wall 39to engage the bent lower ends 98 (Figs. 1 and 2) of the lifting rods 28and 29 from above. Said lever 95 has a curved cam slot 99 (Figs. 1 and14) engaged by the pin 2'73 secured to a small standard or tongue on theswing lever 241. In addition, a pin 95a (Fig. 11) is riveted to saidlever '95 and enters a slot of the contact lever 33l to swing that leverfor closing the contacts 334 when the lever 95 is pressed downwards.

The upper end of an impulse arm or lever I00 (Figs. 1 and 11) isdisplaceably journalled on the pin 53 for the stopping pawls 5i and 52,said impulse lever having an oblong slot through which said pin passes.At its upper end this impulse arm is fork-shaped and has two bent prongsi0| resting on the upper sides of the two pawls 5i and52. At its lowerend this impulse lever carries a pin 193 resting in a slot I04 of thecontact lever 33!.

The slide 24! (Figs. 1, 5 and is controlled by the control lev'er 201-ofthe machine as described in U. S. Patent No. 2,398,286 (details 241 and201 of that patent). The lever 291 serves for setting the machine tomultiplication and to division with automatic shifting. Depending uponthe setting of this lever the slide 24! is in or out of the path ofmotion of the hook or pawl 69. When the control lever is in the positiona or b of Fig. 15 (positions of multiplication) the slide 241 is out ofthe path of motion of the pawl 69, but when the control lever is set toits position 0 for division, the slide 24! enters the path of motion ofsaid pawl.

The release arm 3l0 (Figs. 1, 11 and 12) acts directly upon thesubtraction setting lever 358a (Figs. 1, 11 and 12') of the hook 358.This lever extends outwards through a. slot in the easing E95 of themachine. In the embodiment shown the machine has, in addition to themultiplication key '25 and the division key 19 also an addition key,just as in U. S. Patent No. 2,398,286 but no subtraction key; thus, themachine is set to subtraction by pressing the lever 358a down wards toits lowermost position, and when then the division key is depressed, themachine performs an operation of subtraction as described in connectionwith Fig. 16 of the patent just mentioned. For this purpose the releasearm 3 l B has a striking surface or tongue 319a pressing against theedge or striking surface 318 of the hook 358 when the latter isdepressed due to the fact that the operator presses the lever 358adownwards toits lowermost position (for subtraction) or due to thefactthat the addition key has been depressed manually. Figs. 1 and 11 showthe lever 35% in its uppermost position, while Fig. 12 shows the same inits lowermost position. When the slide 380 is pushed inwards, that is tothe right in Figs. 1, 11 and 12, for instance, due to the manipulationof the clearing key 406, the curve or cam 389a of this slide acts on apin I96 extending through a holeof the intermediate wall 39 and securedto the lever 45. Due to this, the lever is rocked and moves the lockingarm 43 (to the left in Fig. 1 and counter-clockwise in Fig. 4) so thatthe part 42 of that locking arm releases the tongue 4| of the angularpiece 35. Under the action of its spring 40, the angular piece 39 withits guiding slot 2 la is restored to its neutral, central position sothat the coupling pawl i9 is disengaged from the shoulders 20. If themain shaft 58 rotates, when the clearing is started, such rotationisthus stopped, as soon as the current revolution hasbeen completed. The

main shaft. 58 cannot be startedagain-during the clearing operation dueto the fact that the lever 45 keeps the locking arm 43 rocked aside sothat its tongue 42 does not lock the projection 4|; consequently theguiding slot 2 la and the coupling pawl I8 are restored to theirinoperative neutral position, before any of the shoulders 20 come aroundto the pawl I8, during rotation of the gears I4 and I5. When the slide380 is displaced to the right in Fig. 11, the pin 4I2 thereon rocks thearm 4II clockwise in Fig. 11, said arm being pivoted on the pin 333.Consequently, this arm acts on the pin 33Ia and the contacts 334 areclosed for the clearing operation. In clearing operations effected dueto the manipulation of the clearing key 406 or when the machine has beenset to addition or subtraction and consequently the arm 4I I has beenswung clockwise in Figs. 1 and 11, the downwardly extending projection4I Ia of that arm engages the upper side of the bent tongue 269 (Fig. 5)of the lever 2'. This prevents all shifting of the actuator duringcurrent operations of clearing (also when clearing is effectedautomatically at the end of an operation of addition or subtraction).

As is described in detail in U. S. Patent No. 2,398,286, the gears 385,388, 394 (Fig. 1) are driven by the motor M under the control of thecoupling arm 392. The clearing key 406 (Fig. 11) is arranged on the linkor arm 400 which by means of an oblong slot embraces the stationary pin400a and also by means of the pin 4001) is articulately connected withthe lower end of the coupling arm 392, the latter being connected withthe slide 380 by means of a spring 408. This slide has a restoringspring M and in its backward active position it is locked by a pawl 395releasable by the pin 39'! on the gear 394 after the clearing of theactuator has been finished. A pin 40'! is secured to the coupling arm392 and engages a projection on the slide 380 so that said slide isdrawn backwards (to the right in Figs. 1 and 11) when the coupling arm392 is rocked counter-clockwise for effecting a clearing operation(zeroizing).

A disc I0! (Figs. 3 and 11) is rotatably journalled on the main shaft 58and carries two pins I08 and I09 which enter the holes H0 or III,respectively, of the stop discs 56 or respectively, and are guided insaid holes. In clearing operations in connection with addition andsubtraction, the projection 4000 (Fig. 11) of the rod 400 is moved toengage the periphery of the disc I01 when the slide 380 is moved to theright in Fig. 11 and by means of the spring 408 tends to rock thecoupling arm 392 counter-clockwise, said coupling arm being articulatelyconnected with the rod 400. This prevents any clearing operation frombeing started as long as the main shaft 58 rotates. Similarly, theprojection 4000 engages the periphery of the disc I01, when the clearingkey 405 is depressed manually for initiating a clearing operation andthis prevents the clearing operation from beginning as long as the mainshaft rotates. Not until after said shaft has been stopped in its fullcycle position by the stop pawls 5| and 52, does the spring 408 pull theprojection 4000 into the recess I0'Ia of the disc I07, and this swingsthe coupling arm 392 counter-clockwise so that the clearing is effected.Thus, said disc I0! is stopped and locked, but nevertheless the mainshaft 58 may move slightly beyond its position of rest while compressingthe buffer spring 59; for instance, in an operation of addition the disc51 may move somewhat counter-clockwise, because the pin I09 can movesomewhat in the hole III.

8 'Thus, the discs 50' and 51 are rocked during a short moment, whilethe actuator R and the main shaft 58 are stopped and their kineticenergy is absorbed by the buffer spring 59.

MODE OF OPERATION For the various kinds of operation, the devicedescribed acts as follows:

Multiplication The control lever I is set to its position a or b in Fig.15, thus causing the slide 24I controlled thereby to be moved out of thepath of motion of the hook 09 (Figs. 1 and 5). At this setting, theplus-minus-control plate 28! is looked, as described in detail in U. S.Patent No. 2,398,286, and it is consequently not moved by theeccentricdriven lever 261 in its rocking motion.

After the multiplicand has been entered in the actuator R (Fig. 16) inwell-known manner, the multiplication key 75 (Fig. 1) is depressed,causing the arm 85 of that key to rock the contact lever 33I clockwisein Fig. 1 in such manner that the electric contacts 334 for the motor Mare closed. When the motor starts, the swinging arm 23 (Figs. 1 and 4)is rocked by the cam discs 25 and 26. When the operator depresses thekey 15, its oblique edge or hook I9 (Fig. 1) releases the edge 53 of thecoupling rod 28 so that said rod is free and displaced upwards by itsspring 32, Then, the upper part of this rod enters the recess 27 (Figs.1 and 2) of the rocking arm 23 and consequently, the lifted rod 28 ismoved by the rocking arm 23 so that said rod is displaced laterally tothe left in Fig. 2. During this operation, the pin 34 on the rod actsupon the angular piece 35 causing that piece to be displaced to the leftin Fig. 2 and consequently the guiding slot 2Ia (Fig. '7) rocks thecoupling pawl I8 in the same direction, that is upwards in Fig. 16.. Theprojection 42 of the locking arm 43 (Figs. 2 and 4) then engages thebent pawl 4| of the angular piece 35, so that the spring (Fig. 7) cannotrestore said angular piece to its neutral central position. When theangular piece 36 is displaced in the manner just described, the pin 48secured thereto follows and is moved to the left in Fig. 6 to act uponthe conical pins 49, 50 so that they are pressed apart and thus thestopping pawls 5|, 52 are lifted from the shoulders 54, 55 on the buiferdiscs 56 and 57, respectively. The main shaft 50 is now released fromthe stopping pawls and begins rotating in a revolution. When the pawls5I, 52 are lifted, they themselves lift the impulse arm I00.

When the pawl I8 is swung upwardly as described above (see Fig. 16) saidpawl becomes coupled to the shoulder 20* on the gear I5. This couplesthe main shaft 58 with the motor to be driven thereby in revolutions,that is, counter. clockwise in Fig. 1.

When the cam slot disc 62 (Figs. 1 and 8) secured to the shaft 58 beginsmoving, its eccentric slot 34 forces the release arm 3I0 to be rockedclockwise in Figs. 1 and 11, said release arm engaging the slot 54 bymeans of a roller 65. The horizontal arm 65 of the release arm 3I0 thenis lowered towards the striking edge 68 (Figs. 1 and 2) on the couplingrod 28 and thus presses said rod (and also the rod 29) downwards to itslowermost position, which is somewhat lower than its position of restshown in Fig. 1.

The key F5 still remains depressed, and consequently the hook 8I (Figs.1 and 13) on that key is pressed inwardly by the spring 82 to engagetheicoupliiig" maize:anmhezomiquesunracwr: the minister that hookinow:snaps 'imaboveithe edge: 68 of the coupliiig rdd nytorkeepzsaidirodi iiilts 1.-.1 wermost. ipo'sitibri-" -after the moinent at which the arm fieoi the'rel'easezarm 3H3 begins t-o -move countcrciockwise under theaction :of the eccentric camslot pressed; its-Striking surface (Figs. .1.:andi.:13).- i is an the path 10f: motion i oflithe bentfiportionrfl 31 of the' hook 'fifi when sai'd hook isrocked :byithe release arm' 3 lll 'at the rocking :motion of said:

hook 9 -then is disengaged frhm theistationary pin 2 and the "arm SSaslides' freely underthe I m ne-ire 8 of the lever='86"- (see position: eof the actuated. But t the: keyt 'l5' returns -to 'its' posi tion ofrest-inon depresseu:positidm the :striking surface :14 is moved outof-the: path of motion of the tongue l3 of the hook -fi i Under theaction: of"- the torsio'n: spring :1 I the arm 53a is then;-pressedupwards against the--: pin 12 i and slides alongsaid pin 'duringdtsmotion and -with its point strikes thetongtle w of "the -lever 85,

cldck-wis'e in Fig. .5 so -that its" tongue-92 strikes of. the angularipiece 36 whicli :now is restored to it's inoperative central' position'by the spring 40 (Fig.' 7)

in '-Fig.*6"*and thestopping' pawls are released;

their torsion spring now-presses themdownwards against the peripheryofthe buffer discs" 55,'5l. During 'its contii'iued 'rota-tionthemouplingpawl 13 is acted upon by the'oblidue-surface 2lbofthe guide member-"1|(Fig. '7), now

in its central position,*and consequently this pawl" is drawnout-bfitsengagementwith-the shoulder 20 "of: the gear -l5 '(Fi"g.-16)''so that'the main shaft When the 58 is disconnected from the motor.stopping projections 54, ofthe bufferdiscs 56or 51," respectively,are-'just in front of the points of the stopping pawls '5i","52 ,'-thetorsion spring-513i presses these'stoppingpawls-into e'n-"- gagementwith said stop projections 54, 55.' Because the main" shaft 58-isrotating in revolutions, that is counter-clockwisein Fig. 1, the "stopprojection 54" strikes the stop pawl 5l.' The kinetic energy-oftherotat-ing actuator R on the main shaft 58'is absorbed by the bufferspring 59 so :that' the rotating-parts are "softly and safely. stopped;It is to be observed that during the wholebouncingactinythestbppingpawls 52,-5! engage the' *sto 1 2ing projections'55', 54 permanently andwitho'uhany relative motion. This" means that there" is? no risk thatthe stoppin pawls will swing'out an be disconnected',but on thecontrary, the-rotation is rapidly and reliably stopped. Itis tobebbser'ved that, for example" marevolution, the stop pat/v15 I maybedepressed to its lowermost stopping osition almost" one half revolutionbefore the mainshaft '58 issubstantially the shape ofahalf circle andpermitsthestoppingzpawl' 5l to swing-down toits This resto'res -th'e pin48 secured-' to that angular piece to its centralpositibnshown stoppingposition: approximately one half -revolution (of themam-shaft 58i-inadvance. When manner (see UISZ Patent No. 2,398,286) a shiftingimpulse, because the. pawl 265 (Fig. 5) is thus released. and enters-thepath of motion of the driving lever 261, which then drives the swinginglever 2 "carrying the pawl 265 with which the step-shifting mechanism ofthe actuator may be coupled." When thus the swinginglever 241 beginsmoving (to the left in Fig. 5) the pin 213' secured to said lever actsupon the arm 2' and presses it downwards in Fig.5 so that the tongue 9Bof the lever 86again' engages the surface 93 and locks the arm 211 inits lowermost position shown in Fig. '5. During this operation, said pin2T3 moves in the slot 99 (Figs. land 14) of the keydepresser-or keyholding-down member 95,

which'is consequently'depressed so that its bent portion 9'? presses thebent lower ends 98 of the coupling rods 28, 29' downwards; Consequently,

said rods cannot be released and cannot-be lifted upwards to engage therocking lever 23. Thus. the'main'shaft 58-- andconsequently also theactuator R cannot be-started; as long as a shifting operation is'beingcarried out.

When the multiplicationkey 15 returns 'toits' position of rest, thecontact lever 33l is still kept 'inits operativepositionandkeepsthecontacts 33e closed, because the-pin I33 -oftheimpulse lever i530 (Figs.1 and 11) presses on thecontact lever, said impulselever being nowraised'to its uppermost position by the liftedstop pawls 5 L52; Theelectric contacts'334' hence remain closed until the pawls Hand 52 pivotdownwardly to engage the projections"54 and55'; and thus move the armI55 downwardly to'openthe contacts. However, before "this-occurs thepawls have =arrested the main shaft 58 and'the-actuatorR' in full cycleposition. This'zris-very important for arapid and reliable .action ofthe machine.

Division For division'the'control-lever ZUI-is set manually to its rightpositionat c in Fig. 15. Thus, the slide 2M is moved into the path ofmotion of the hook 69(Figs. 1 and 5). As is described in detail in U.S..Patent:No. 2,398,286,- the plusminus-controlplate 281 is now freeand-can be dieplaced, when a shifting impulse arrives.

The dividend is' entered in well-known manner into the actuator R and istransferred to the results register. The actuator .(and, if necessary,

i also the revolutions counter) is cleared and then the divisor is.enteredinto the. actuator, which is now in the usualmannertabuiated toits extreme left position, thatis tothe highest, decimal denominationsofrthe results register; To start the machine the. operator .nowdepresses the division key l5 which actuates the contact. lever 33! andcloses the electric contacts 334.. In amanner analogous withnthatdescribed above under the heading Multiplication,. the coupling rod 29.

its edgeengages slideson the slide 241, as,

shown at e in Fig. 5. The slide 24! thus prevents the hook 69 frommoving to its effective position ,f after the division key 16 has beenrestored to its position of rest. In other words, the hook 69 will notact upon the part 89 of the lever 86. Said lever thus remains unactuatedand the main shaft 58 with the actuator R continues rotating inrevolutions until the capacity of the results register is exceeded and,consequently, a ten is carried from the highest denomination of thatregister. This swings the arm I82 in the direction of the arrow A inFig. and this motion is transferred to the lever 86 which isconsequently swung counter-clockwise. As described above under theheading Multiplication this causes the striking surface 92 to swing thearm 45 (Figs. 1 and 4) and consequently the locking arm 43. Hence, theangular piece 36 is now free and it is restored to its inoperative,central position so that the main shaft 58 is disengaged from the motorand the actuator R is resiliently stopped by the stopping pawls 5i and52.

When the lever 86 in the manner just described is rockedcounter-clockwise in Figs. 1 and 5 under the action of an impulse fromthe arm H32 at the tens transfer, also the arm 2' is released from thetongue 90 and this releases in well-known manner (U. S. Patent No.2,398,-

286) a shifting impulse, because the pawl 265 a is released and springsout into the path of mo tion of the driving lever 261. Consequently saidlever now drives the swinging lever 24'! carrying the pawl 265 to shiftthe actuator one step. When the angle piece 36 is moved to its outermostposition position) it acted in well-known manner on theplus-minus-coupling arm 294, and said arm then sets the control plate281 to pull down the multiplication key l5 via its projection 298'. Thedriving lever 25'! by means of the plusminus-driving lever 274 acts onthe control plate 281 to displace it and to cause it to pull down themultiplication key 15.

Then, the automatic division is continued in well-known manner.

Addition When the item (addend) has been set in the actuator R inwell-known manner, the actuator, upon the depression of the additionkey, performs one single revolution in the manner described above underthe heading Multiplication and is stopped. Then the actuator isautomatically cleared in the manner described in U. S. Patent No.2,398,286 due to the fact that theslide 380 is displaced to the right inFig. 11, when the hook 358 is moved downwards (counterclockwise) at thedepression of the addition key.

Subtraction Subtraction is carried out similarly as an operation ofaddition. The subtrahend is set in the actuator R, the setting lever358a for subtraction is moved downwards by the operator and the divisionkey 76 is depressed. Now the actuator performs a revolution, is stoppedand automatically cleared.

What weclaim 18*.

1. In a power operated calculating machine, in combination,multiplication and division keys independent of each other, an actuator,an electric motor, a coupling under the control of said keys forcoupling said motor to said actuator for rotating the latter in eitherdirection selectively, lifting rods for controlling said coupling,lifting springs for said rods, said rods being normally locked in theirlower position by said keys against the lifting action of said springs,a restoring lever driven by said motor, and a projection on saidrestoring lever for restoring said lifting rods to their lowerpositions.

2. In a power operated calculating machine having an actuator rotatablein two directions under the control of a multiplication key and adivision key and also having a step shifting mechanism for said actuatorfor shifting it rectilinearly in either direction, in combination,normally ineffective cyclically driven means for operating said shiftmechanism, a cam disc connected for rotation in synchronism with saidactuator, a follower engaging said cam disc, and an impulse hookjournalled on said follower and under the control of said keys forrendering said normally ineifective means effective, said hookcoopcrating with said keys to be disabled thereby when depressed andreenabled when released.

3. In a power operated calculating machine having an actuator rotatablein two directions under the control of a multiplication key and adivision key and also having an impulse operated step shifting mechanismfor the relative denominational shifting of said actuator rectilinearlyin two opposite directions, a cyclically operated driving lever and anormally uncoupled swing lever operable by the driving lever to operatesaid shifting mechanism, in combination, an impulse giving member underthe direct contro1 of said keys operative to couple said swing lever tosaid driving lever, said member cooperating with said keys to berendered inoperative to give a releasing impulse for coupling the swinglever to the driving lever when one of said keys is depressed but againrendered operative to give an impulse to couple said swing lever to thedriving lever when said depressed key is released, and power operatedmeans for automatically reciprocating said release impulse giving memberthrough its impulse giving motion at every rotary operation of theactuator.

In a power operated calculating machine having an actuator rotatable intwo directions under the control of a multiplication key and a divisionkey and also having an impulse operated step shifting mechanism for therelative denominational shifting of said actuator rectilinearly in twoopposite directions, a cyclically operated driving lever and a normallyuncoupled swing lever adapted to be driven by the driving lever tooperate said shifting mechanism, in combination, a releasing memberunder the direct control of said keys operative to couple said swinglever to said driving lever, said member cooperating with said keys tobe rendered inoperative to efiect coupling of said swing lever to saiddriving lever for providing an impulse to said step shifting mechanismwhen one of said keys is depressed but again rendered operative toeffect coupling of the swing lever to the driving lever to provide animpulse to said shifting mechanism when said depressed key is released,power operated means for automatically reciprocating said releasingmember at every rotary operation of the actuator, and a full cyclemechanism for stopping the rotation of said actuator, said full cyclemechanism being actuated by said releasing member when said depressedkey is released 7 from its depressed position.

5. In a power operated calculating machine having an actuator rotatablein two directions under the control of a multiplication key and adivision keyand also having a step shifting mechanism for said actuatorfor shifting it rectilinearly in either direction, a cyclically operateddriving lever and a normally uncoupled swing lever adapted to be coupledto and driven by the driving lever to operate said shifting mechanism,in combination, a full cycle mechanism for stopping the rotation of saidactuator, a cyclically operable releasing member cooperating with andunder the direct control of said keys so as to be rendered effectiveupon release of a depressed key, a lever rockable by said releasingmember, when effective, to couple said swing lever to said drivinglever, a motor, a coupling adapted to couple said actuator to said motorfor rotation in either direction, lifting rods under the control of saidmultiplication and division keys for controlling said coupling, a guidemember for said coupling and said lifting rods, a locking device forsaid guide member and thus for said coupling, and arm rockable torelease said locking device and to render said full cycle mechanismoperative, said arm being in the path of said lever and being operatedthereby when the lever is rocked by said releasing member.

6. In a power operated calculating machine having an actuator rotatablein two directions under the control of a multiplication key and adivision key, and also having a step shifting mechanism for saidactuator for shifting it retilinearly in either direction, incombination, a motor, a pair of rotatable members, gearing between saidmotor and said members for driving the latter in opposite directions ofrotation, clutch means for connecting said actuator to either of saidmembers, lifting rods, one rod being associated with each key, a liftingspring urging each of said rods from a normal position, said rods beingrestrained by said keys against the urge of said springs and adaptedunder the urge of said springs to cause adjustment of said clutch meansfor positive or negative rotation of said actuator according to which ofsaid keys is depressed, each said key having a fixed striking surfacefor locking the associated rod against the urge of its spring as long asits associated key is in normal undepressed position, cyclicallyoperated means for restoring said lifting rods to normal position, and alocking hook pivoted on each said key to keep the associated lifting rodlocked in its normal position, as long as the associated key remainsdepressed.

ERIK GRIP.

STURE TOORELL.

REFERENCES CITED The following references are of record in the file ofthis pa-tent:

UNITED STATES PATENTS Number Name Date 1,539,461 Breitling May 26, 19251,773,026 Chase Aug. 12, 1930 1,801,902 Britten Apr, 21, 1931 1,868,407Brown et al July 19, 1932 2,010,068 Duke Aug. 6, 1935 2,068,899 Annerenet a1. Jan. 26, 1937 2,152,199 Machado Mar. 28, 1939 2,398,286 Carlstromet al Apr. 9, 1946 FOREIGN PATENTS Number Country Date 551,311 GreatBritain -1 Feb. 17, 1943

